<?php
class AlipayService
{
	protected $appId;
	protected $notifyUrl;
	protected $charset;
	//私钥值
	protected $rsaPrivateKey;
	protected $totalFee;
	protected $outTradeNo;
	protected $orderName;

	public function __construct()
	{
		$this->charset = 'utf8';
	}

	public function setAppid($appid)
	{
		$this->appId = $appid;
	}

	public function setNotifyUrl($notifyUrl)
	{
		$this->notifyUrl = $notifyUrl;
	}

	public function setRsaPrivateKey($saPrivateKey)
	{
		$this->rsaPrivateKey = $saPrivateKey;
	}

	public function setTotalFee($payAmount)
	{
		$this->totalFee = $payAmount;
	}

	public function setOutTradeNo($outTradeNo)
	{
		$this->outTradeNo = $outTradeNo;
	}

	public function setOrderName($orderName)
	{
		$this->orderName = $orderName;
	}

	/**
	 * 发起订单
	 * @return array
	 */
	public function doPay()
	{
		//请求参数
		$requestConfigs = array(
			'out_trade_no'=>$this->outTradeNo,
			'total_amount'=>$this->totalFee, //单位 元
			'subject'=>$this->orderName,  //订单标题
			'timeout_express'=>'2h'       //该笔订单允许的最晚付款时间，逾期将关闭交易。取值范围：1m～15d。m-分钟，h-小时，d-天，1c-当天（1c-当天的情况下，无论交易何时创建，都在0点关闭）。 该参数数值不接受小数点， 如 1.5h，可转换为 90m。
		);
		$commonConfigs = array(
			//公共参数
			'app_id' => $this->appId,
			'method' => 'alipay.trade.precreate',             //接口名称
			'format' => 'JSON',
			'charset'=>$this->charset,
			'sign_type'=>'RSA2',
			'timestamp'=>date('Y-m-d H:i:s'),
			'version'=>'1.0',
			'notify_url' => $this->notifyUrl,
			'biz_content'=>json_encode($requestConfigs),
		);
		$commonConfigs["sign"] = $this->generateSign($commonConfigs, $commonConfigs['sign_type']);
		$result = $this->curlPost('https://openapi.alipay.com/gateway.do',$commonConfigs);
		return json_decode($result,true);
	}
	public function generateSign($params, $signType = "RSA") {
		return $this->sign($this->getSignContent($params), $signType);
	}
	protected function sign($data, $signType = "RSA") {
		$priKey=$this->rsaPrivateKey;
		$res = "-----BEGIN RSA PRIVATE KEY-----\n" .
			wordwrap($priKey, 64, "\n", true) .
			"\n-----END RSA PRIVATE KEY-----";
		($res) or die('您使用的私钥格式错误，请检查RSA私钥配置');
		if ("RSA2" == $signType) {
			openssl_sign($data, $sign, $res, version_compare(PHP_VERSION,'5.4.0', '<') ? SHA256 : OPENSSL_ALGO_SHA256); //OPENSSL_ALGO_SHA256是php5.4.8以上版本才支持
		} else {
			openssl_sign($data, $sign, $res);
		}
		$sign = base64_encode($sign);
		return $sign;
	}
	/**
	 * 校验$value是否非空
	 *  if not set ,return true;
	 *    if is null , return true;
	 **/
	protected function checkEmpty($value) {
		if (!isset($value))
			return true;
		if ($value === null)
			return true;
		if (trim($value) === "")
			return true;
		return false;
	}
	public function getSignContent($params) {
		ksort($params);
		$stringToBeSigned = "";
		$i = 0;
		foreach ($params as $k => $v) {
			if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {
				// 转换成目标字符集
				$v = $this->characet($v, $this->charset);
				if ($i == 0) {
					$stringToBeSigned .= "$k" . "=" . "$v";
				} else {
					$stringToBeSigned .= "&" . "$k" . "=" . "$v";
				}
				$i++;
			}
		}
		unset ($k, $v);
		return $stringToBeSigned;
	}
	/**
	 * 转换字符集编码
	 * @param $data
	 * @param $targetCharset
	 * @return string
	 */
	function characet($data, $targetCharset) {
		if (!empty($data)) {
			$fileType = $this->charset;
			if (strcasecmp($fileType, $targetCharset) != 0) {
				$data = mb_convert_encoding($data, $targetCharset, $fileType);
				//$data = iconv($fileType, $targetCharset.'//IGNORE', $data);
			}
		}
		return $data;
	}
	public function curlPost($url = '', $postData = '', $options = array())
	{
		if (is_array($postData)) {
			$postData = http_build_query($postData);
		}
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
		curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
		if (!empty($options)) {
			curl_setopt_array($ch, $options);
		}
		//https请求 不验证证书和host
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
		$data = curl_exec($ch);
		curl_close($ch);
		return $data;
	}
}
?>